A tetrazolinone compound represented by formula (1): [in the formula, R1 represents an alkyl group having 1-6 carbon atoms or the like] can be produced by reacting a compound represented by formula (2): [in the formula, X1 represents
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Paragraph 0142; 0143
(2017/03/21)
Halogen-metal exchange of 3-substituted 1,2-dibromoarenes: The use of long-range JCH coupling constants to determine regiochemistry
Regioselective halogen/metal exchange reactions were carried out on a series of 3-substituted-1,2-dibromoarenes. Product mixtures were quenched with CO2 to form the corresponding benzoic acid analogs to facilitate HPLC and NMR analysis. Substitution at the 3-position could readily be assigned on the basis of 2D HMBC long-range correlations, while assignment at the 2-position was not as straightforward. The use of three-bond JCH coupling constant measurements, extracted from 1-D 1H coupled 13C experiments, were necessary to render unequivocal regio assignments. Copyright
Selective Oxidation of 2-Bromo-m-xylene to 2-Bromo-3-methylbenzoic Acid or 2-Bromoisophthalic Acid
Aqueous sodium dichromate oxidation of 2-bromo-m-xylene (1) under a carbon dioxide pressure gave 2-bromoisophthalic acid (58percent), while NBS-bromination of 1 followed by Sommelet oxidation to aldehyde and then potassium permanganate oxidation enabled t